Loans, Net - Loans identified as impaired by class of loan (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Recorded Investment [Abstract]
With no related allowance recorded	$ 9,552	$ 13,690
With an allowance recorded	11,381	8,468
Total	20,933	22,158
Unpaid Principal Balance [Abstract]
With no related allowance recorded	9,552	13,818
With an allowance recorded	11,432	9,370
Total	20,984	23,188
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	2,962	2,669
Total	2,962	2,669
Average Recorded Investment [Abstract]
With no related allowance recorded	9,585	13,879
With an allowance recorded	11,823	8,892
Total	21,408	22,771
Interest Income Recognized [Abstract]
With no related allowance recorded	192	592
With an allowance recorded	139	89
Total	331	681
Construction [Member]
Recorded Investment [Abstract]
With no related allowance recorded	105	131
With an allowance recorded	107	115
Unpaid Principal Balance [Abstract]
With no related allowance recorded	105	131
With an allowance recorded	107	115
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	57	66
Average Recorded Investment [Abstract]
With no related allowance recorded	118	138
With an allowance recorded	111	124
Interest Income Recognized [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	0	0
Secured by farmland [Member]
Recorded Investment [Abstract]
With no related allowance recorded	7,903	7,903
With an allowance recorded	0	0
Unpaid Principal Balance [Abstract]
With no related allowance recorded	7,903	7,903
With an allowance recorded	0	0
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	0	0
Average Recorded Investment [Abstract]
With no related allowance recorded	7,903	7,903
With an allowance recorded	0	0
Interest Income Recognized [Abstract]
With no related allowance recorded	177	454
With an allowance recorded	0	0
Secured by 1-4 family residential [Member]
Recorded Investment [Abstract]
With no related allowance recorded	1,083	1,919
With an allowance recorded	4,445	3,694
Unpaid Principal Balance [Abstract]
With no related allowance recorded	1,083	2,047
With an allowance recorded	4,496	3,746
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	1,376	1,370
Average Recorded Investment [Abstract]
With no related allowance recorded	1,094	2,032
With an allowance recorded	4,480	3,704
Interest Income Recognized [Abstract]
With no related allowance recorded	2	16
With an allowance recorded	9	11
Other real estate loans [Member]
Recorded Investment [Abstract]
With no related allowance recorded	0	3,289
With an allowance recorded	4,220	1,242
Unpaid Principal Balance [Abstract]
With no related allowance recorded	0	3,289
With an allowance recorded	4,220	1,242
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	463	294
Average Recorded Investment [Abstract]
With no related allowance recorded	0	3,352
With an allowance recorded	4,236	1,260
Interest Income Recognized [Abstract]
With no related allowance recorded	0	104
With an allowance recorded	118	69
Commercial loans [Member]
Recorded Investment [Abstract]
With no related allowance recorded	461	448
With an allowance recorded	307	398
Unpaid Principal Balance [Abstract]
With no related allowance recorded	461	448
With an allowance recorded	307	1,248
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	46	292
Average Recorded Investment [Abstract]
With no related allowance recorded	470	454
With an allowance recorded	334	783
Interest Income Recognized [Abstract]
With no related allowance recorded	13	18
With an allowance recorded	12	7
Consumer loans [Member]
Recorded Investment [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	2,302	3,019
Unpaid Principal Balance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	2,302	3,019
Related Allowance [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	1,020	647
Average Recorded Investment [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	2,662	3,021
Interest Income Recognized [Abstract]
With no related allowance recorded	0	0
With an allowance recorded	$ 0	$ 2